3-3 invasion issue

Hey all, i’m studying some invasions on :
https://senseis.xmp.net/?4463Enclosure33Invasion
where in
image
There is a note
“There are two standard josekis for the 3-3 invasion, both leading to ko for life. If White wins this ko, then White captures at a , which can cause considerable damage to Black’s position.”
How can white win this kom subce black can capture the white stone on 3?

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It’s a ko. Black captures the white “3” stone, white plays a ko threat somewhere else, black responds elsewhere, white plays “3” again.

White, of course, should have ko threats available prior to starting down this road.

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